You are March applicant now. What did you get wrong?
I also got it back, sent it first time in December.
Schedule A plus police certificates.
From what I could see there was also a contradiction in terms of needing one for Canada, as well as your previous country. (For me that was the UK). But from researching others who also had this problem, you just get your previous country's certificates and wait on the Government of Canada if you need to get one for them as well.
Application re-submitted including Schedule 8 and UK Police certificates. Nothing else was quoted as being missing / incomplete so hopefully that's it now for the time being.